Wastewater purifying apparatus

Abstract

To purify wastewater discharged from lavatories (3), a wastewater purifying apparatus having a shell contact aeration chamber (6, 7) placed with shell microbial carrier members (15), the wastewater being fed to and purified in the shell contact aeration chamber (6, 7). Shells whose mother-of-pearl layer on the inner surface (b) is at least removed are used as the microbial carrier member (15).

What is claimed is:  
     
       1. A wastewater purifying apparatus comprising a shell contact aeration chamber including calcium carbonate based shells of shellfish for purifying supplied wastewater therein, the shells being used as microbial carriers with a mother-of-pearl layer on inner surfaces of the shells being removed. 
     
     
       2. A wastewater purifying apparatus according to  claim 1 , further comprising an activated carbon adsorption chamber including coal-based activated carbon and arranged downstream of the shell contact aeration chamber. 
     
     
       3. A wastewater purifying apparatus according to  claim 1 , further comprising a denitrification chamber which is arranged upstream of the shell contact aeration chamber, the denitrification chamber being provided with a bioreactor including a membranous container containing a hydrogen donor. 
     
     
       4. A wastewater purifying apparatus according to  claim 1 , wherein the shellfish includes at least one of oysters, scallops, Sakhalin clams, pearl shells, clams, fresh water claims, short-necked clams, Chinese mecta, mussels, top shells, giant clams and fossil shells. 
     
     
       5. A wastewater purifying apparatus according to  claim 1 , wherein the shells are packed in a mesh bag and installed in the shell contact aeration chamber.